﻿Public Class Form2

    Private Sub RadioButton2_CheckedChanged(sender As Object, e As EventArgs) Handles RadioButton2.CheckedChanged
        TextBox1.Enabled = False
        If RadioButton1.Checked = True Then
            RadioButton1.Checked = False
        End If
    End Sub

    Private Sub RadioButton1_CheckedChanged(sender As Object, e As EventArgs) Handles RadioButton1.CheckedChanged
        If RadioButton2.Checked = True Then
            RadioButton2.Checked = False
            TextBox1.Enabled = True
        End If
    End Sub

End Class